CN104089595A - Stope face basic roof advanced fracturing distance determining method - Google Patents
Stope face basic roof advanced fracturing distance determining method Download PDFInfo
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- CN104089595A CN104089595A CN201410300444.7A CN201410300444A CN104089595A CN 104089595 A CN104089595 A CN 104089595A CN 201410300444 A CN201410300444 A CN 201410300444A CN 104089595 A CN104089595 A CN 104089595A
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Abstract
The invention discloses a stope face basic roof advanced fracturing distance determining method. A stoping roadway a certain distance away from the front of the working face serves as a measuring station, an anchor cable stress monitoring system is installed on all of top plate anchor cables close to the middle of a roadway outline in the measuring station, working resistances of all of anchor cables in the measuring station are recorded once advancing is performed on the working face for a certain distance, a stress monitoring distance serves as a horizontal ordinate, the working resistances of all of anchor cables serve as a longitudinal ordinate, and an anchor cable working resistance curve chart for each advancing distance is drawn. Stress monitoring distances corresponding to catastrophe points are obtained according to catastrophe curves, the working face advancing distance is subtracted from the stress monitoring distance to obtain a basic roof advanced fracturing distance. The stope face basic roof advanced fracturing distance determining method is low in device cost and simple in operation, a unique device is a common anchor cable stress monitoring system, is convenient to install and automatically records data, the monitoring project amount is small, additional drilling is not needed, and the method can be achieved only by utilizing existing roadway supporting anchor cables.
Description
Technical field
The method that the present invention relates to the front fracture of the basic toplap of a kind of definite coal face distance, belongs to rock pressure [in mine and support engineering technical field.
Background technology
The original equilibrium state of coal petrography system has been broken in the exploitation of coal mine work area, and under the effect of rock pressure [in mine, superincumbent stratum is by the rupture failure of generating period.Superincumbent stratum comprises the immediate roof that contacts with coal seam and basic top more than immediate roof.Wherein, periodically rupture workplace come to Compressive Strength and presentation attributes generation material impact in basic top.Can obtain periodic weighting step pitch L by Face Pressure recording geometry at present
0to ore deposit pressure prediction, forecast plays a role, but research and practice discovery, in grasping periodic weighting step pitch, accurately grasp the front fracture position of basic toplap, the dynamic disasters such as rock burst, coal and the Gas Outburst that prevention movement of roof is brought out are significant again.The workplace that particularly basic top is tight roof condition, deep condition of high ground stress and coal and Gas Outburst unsafe conditions, more needs to be grasped the accurate location rupturing before basic toplap.
At present, the method that obtains the front fracture position of basic toplap mainly contains theoretical calculating, numerical simulation, because rock is a kind of non-linear, anisotropic complicated mechanics medium, and geology and mining conditions complicated and changeable, adopt theoretical calculate and method for numerical simulation often has larger error.
In order to reduce error, also has at present field monitoring.Field monitoring mainly contains micro seismic method and acoustic-emission.Micro seismic method, mainly by various types of Microseismic monitoring system, carries out system monitoring to the situation of breaking of coal petrography stone.Micro seismic method automaticity is high, but signals collecting is vulnerable to the interference of the work such as working face mining, tunnelling, causes the signal accuracy rate of collection low, and signal work for the treatment of is very complicated; And Microseismic monitoring system cost is very high, measuring point is assigned a work loaded down with trivial details, and construction work amount is large, and labour intensity is large.Acoustic emission method obtains roof break situation by monitoring elastic wave, its observation process is also subject to the impact of working face mining, tunnelling etc., and data interpretation need of work database and the Site Detection experience enriched very much, can only analyze by professional and technical personnel.
Chinese patent 200920007099.2 also discloses the leading fracture position electromagnetic radiation monitoring of a kind of tight roof predictor.The main monitoring index of this device discharges ELECTROMAGNETIC RADIATION SIGNATURE while being tight roof fracture, determines the leading fracture position of top board by the difference of electromagnetic signal before and after roof break.While adopting this device, measuring point is assigned a work simply, and labour intensity is low, but exists equally ELECTROMAGNETIC RADIATION SIGNATURE to be subject to the shortcoming that working face mining, tunnelling etc. are disturbed, signal treatment process complexity.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, definite method of the front fracture of the basic toplap of a kind of coal face simple to operate, that reliability is high, cost is low, applied widely distance is provided.
For achieving the above object, the technical scheme that the present invention takes is:
A definite method for fracture distance before the basic toplap of coal face, is characterized in that:
The first step: after support in gateway of coal mining face driving, adopt anchor pole and anchor cable to carry out supporting to back, require anchorage cable anchoring on basic top or basic top above more in stable rock stratum;
Second step: before working face mining, first obtain the periodic weighting step pitch L that Face Pressure recording geometry obtains that passes through in this ore deposit
0; Using the mining roadway of workplace front certain distance as survey station, described certain distance is periodic weighting step pitch L
02-4 doubly, in survey station, select all top board anchor cables near tunnel outline line middle part, anchor cable stress monitoring system is installed;
The 3rd step: in working face mining, by anchor cable stress monitoring system, the working resistance of each anchor cable in survey station is carried out to Real-Time Monitoring, the every propelling certain distance of workplace, is generally no more than 1m, records the working resistance value of each anchor cable;
The 4th step: using stress monitoring distance as horizontal ordinate, each anchor cable working resistance is as ordinate, each anchor cable working resistance curve map while drawing each advance distance, wherein, stress monitoring distance refers to the distance between position and workplace initial propulsion position that anchor cable is in; In the curve map of all advance distances, while there is curve that anchor cable working resistance undergos mutation, no longer continue monitoring; According to this sudden change curve, obtain horizontal ordinate corresponding to catastrophe point, i.e. corresponding stress monitoring distance, deducts now face advanced distance with this stress monitoring distance, is the front fracture of basic toplap distance.
Principle of work of the present invention and advantage are:
1, in the time of basic rimrock fault rupture, the anchor cable working resistance that is arranged on this place can be undergone mutation, from all curves of working resistance curve map, find out the curve that working resistance is undergone mutation, this curve correspondence the distance of the advance of the face, show again the distance initial from workplace, thereby calculating easily the front fracture of basic toplap distance.The present invention makes full use of workplace and substantially pushes up when fracture and cause back anchor cable working resistance this fact of suddenling change, and is changed and can directly be obtained fracture position before the basic toplap of workplace, so data processing work is simple by top board anchor cable working resistance.
2, equipment cost is low, simple to operate.Unique equipment required for the present invention is anchor cable stress monitoring system, and it is that monitoring equipment is pressed in a kind of conventional ore deposit, easy for installation, record data automatically, and monitoring works amount is little, without other drilling, as long as utilize the anchor cable of existing roadway support.
3, be not subject to the restriction of geology and mining conditions etc., be applicable to the mining roadway of all cable boltings, be not subject to the impact of gas, hydrogeology, recovery method etc.
Brief description of the drawings
Fig. 1 is that embodiment of the present invention back anchor cable stress monitoring system is installed the main schematic diagram of looking.
Fig. 2 is that embodiment of the present invention back anchor cable stress monitoring system is installed schematic side view.
Fig. 3 is fracture schematic diagram before the basic toplap of embodiment of the present invention workplace.
Fig. 4 is embodiment of the present invention back anchor cable working resistance monitoring result curve map.
Marginal data: 1---coal face; 2---tunnel; 3---immediate roof; 4---top substantially; 5---anchor cable; 6---anchor cable stress monitoring system; 7---fracture position before basic toplap; 8---anchor pole.
Embodiment
Below by embodiment and accompanying drawing, the present invention is described in further detail.
Certain ore deposit 20306 workplace moves towards long 196m, be inclined to long 1244.6m, the thick 2.54m in coal seam, full-seam mining exploitation, mining roadway net section 4.5m × 2.7m, adopts anchor rete cord combined supporting, anchor pole is the twisted steel anchor rod of Ф 20mm × 2200mm, between array pitch be 800 × 800mm, anchor cable is the steel strand wires of Ф 15.24mm × 7000mm, an array pitch is 2000 × 2400mm.According to Face Pressure observation, its periodic weighting step pitch is about 24m.
Due to workplace periodic weighting step pitch L
0for 24m, and survey station position is workplace front periodic weighting step pitch L
0scope doubly of 2-4, be 24* (2-4)=(48-96) m.
Before basic toplap, fracture distance determines that method is as follows:
The first step:
After the driving of the tunnel 2 of coal face 1, adopt anchor pole 8 and anchor cable 5 to carry out supporting to back, require anchor cable 5 through immediate roof 3, and stable anchorage is on basic top 4 or substantially push up 4 more in the rock stratum on top, as shown in Figure 1, 2;
Second step:
Before workplace 1 exploitation, using workplace front 48～96m scope as survey station, in survey station, select, on the anchor cable 5 near tunnel outline line middle part, anchor cable stress monitoring system 6 is installed, as shown in Figure 1, 2;
The 3rd step:
In workplace 1 exploitation, by anchor cable stress monitoring system 6, the working resistance of each anchor cable in survey station is carried out to Real-Time Monitoring, 1 meter of the every propelling of workplace, records the working resistance value of each anchor cable 5;
The 4th step:
Using stress monitoring distance (being the distance between the anchor cable position and the workplace initial propulsion position that are in) as horizontal ordinate, each anchor cable working resistance is as ordinate, each anchor cable working resistance curve map while drawing each advance distance, anchor cable working resistance curve (other advance position curves to omit) when (for the ease of drawing, in figure, true origin is not at workplace initial position) shows 0 meter of the advance of the face (initial propulsion position), 20 meters, 40 meters and 44 meters as shown in Figure 4; As can be seen from the figure, when 44 meters of the advances of the face, anchor cable working resistance apart from 52 meters of, initial propulsion position is undergone mutation, illustrate that this position is fracture position 7 before basic toplap, deduct now 44 meters of face advanced distances with 52 meters of this stress monitoring distances and be the distance that ruptures before basic toplap, be 52m-44m=8m (seeing Fig. 3).
In addition, adopt respectively micro seismic method and the disclosed tight roof of patent 200920007099.2 leading fracture position electromagnetic radiation monitoring predictor and technology, respectively fracture position before the basic toplap of this workplace is monitored, before determined basic toplap, fracture distance is respectively 7.7m, 8.2m, thereby has verified the correctness of the method for the invention.But with respect to these two kinds of methods, the present invention is obviously simple to operate, and cost is low, is more convenient for promoting on a large scale.
Claims (1)
1. a definite method for fracture distance before the basic toplap of coal face, is characterized in that,
The first step: after support in gateway of coal mining face driving, adopt anchor pole and anchor cable to carry out supporting to back, require anchorage cable anchoring on basic top or basic top above more in stable rock stratum;
Second step: before working face mining, first obtain the periodic weighting step pitch L that Face Pressure recording geometry obtains that passes through in this ore deposit
0; Using the mining roadway of workplace front certain distance as survey station, described certain distance is periodic weighting step pitch L
02-4 doubly, in survey station, select all top board anchor cables near tunnel outline line middle part, anchor cable stress monitoring system is installed;
The 3rd step: in working face mining, by anchor cable stress monitoring system, the working resistance of each anchor cable in survey station is carried out to Real-Time Monitoring, the every propelling certain distance of workplace, records the working resistance value of each anchor cable;
The 4th step: using stress monitoring distance as horizontal ordinate, each anchor cable working resistance is as ordinate, each anchor cable working resistance curve map while drawing each advance distance, wherein, stress monitoring distance refers to the distance between position and workplace initial propulsion position that anchor cable is in; In the curve map of all advance distances, while there is curve that anchor cable working resistance undergos mutation, no longer continue monitoring; According to this sudden change curve, obtain horizontal ordinate corresponding to catastrophe point, i.e. corresponding stress monitoring distance, deducts now face advanced distance with this stress monitoring distance, is the front fracture of basic toplap distance.
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| CN109490086A (en) * | 2018-12-24 | 2019-03-19 | 山东科技大学 | A kind of supporting roadway surrounding rock strength test device and strength determining method |
| CN110132199A (en) * | 2019-05-06 | 2019-08-16 | 山东科技大学 | A kind of hard base object model fragmentation parameters in-situ measurement method of stope |
| CN110579194A (en) * | 2019-09-26 | 2019-12-17 | 山东科技大学 | On-site testing method and application of fracture position of lateral basic roof rock beam of gob-side roadway |
| CN112305608A (en) * | 2020-10-28 | 2021-02-02 | 河北煤炭科学研究院有限公司 | Method and device for calculating pressure step of stope face and terminal equipment |
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| CN110132199A (en) * | 2019-05-06 | 2019-08-16 | 山东科技大学 | A kind of hard base object model fragmentation parameters in-situ measurement method of stope |
| CN110132199B (en) * | 2019-05-06 | 2020-10-02 | 山东科技大学 | Method for detecting hard basic roof fracture parameters of stope face on site |
| CN110579194A (en) * | 2019-09-26 | 2019-12-17 | 山东科技大学 | On-site testing method and application of fracture position of lateral basic roof rock beam of gob-side roadway |
| CN112305608A (en) * | 2020-10-28 | 2021-02-02 | 河北煤炭科学研究院有限公司 | Method and device for calculating pressure step of stope face and terminal equipment |
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